7 replies

How to bind to services

Hello,

I am new to workers and trying to understand service binding. In the wrangler init TypeScript project there is an environment interface:

export interface Env {
    // Example binding to KV. Learn more at https://developers.cloudflare.com/workers/runtime-apis/kv/
    // MY_KV_NAMESPACE: KVNamespace;
    //
    // Example binding to Durable Object. Learn more at https://developers.cloudflare.com/workers/runtime-apis/durable-objects/
    // MY_DURABLE_OBJECT: DurableObjectNamespace;
    //
    // Example binding to R2. Learn more at https://developers.cloudflare.com/workers/runtime-apis/r2/
    // MY_BUCKET: R2Bucket;
}

export interface Env {
    // Example binding to KV. Learn more at https://developers.cloudflare.com/workers/runtime-apis/kv/
    // MY_KV_NAMESPACE: KVNamespace;
    //
    // Example binding to Durable Object. Learn more at https://developers.cloudflare.com/workers/runtime-apis/durable-objects/
    // MY_DURABLE_OBJECT: DurableObjectNamespace;
    //
    // Example binding to R2. Learn more at https://developers.cloudflare.com/workers/runtime-apis/r2/
    // MY_BUCKET: R2Bucket;
}

What I am trying to understand is where the values

KVNamespace

KVNamespace

R2Bucket

R2Bucket

are coming from. In my wranlger.toml I have a

binding = "DB"

binding = "DB"

(in this case D1) but I don't know how to use

env.DB

env.DB

in the code since TypeScript says

DB does not exist on type Env

DB does not exist on type Env

. I understand it needs to be added into the interface but not sure how to reference it there.

How to bind to services

Hello,

I am new to workers and trying to understand service binding. In the wrangler init TypeScript project there is an environment interface:

export interface Env {
    // Example binding to KV. Learn more at https://developers.cloudflare.com/workers/runtime-apis/kv/
    // MY_KV_NAMESPACE: KVNamespace;
    //
    // Example binding to Durable Object. Learn more at https://developers.cloudflare.com/workers/runtime-apis/durable-objects/
    // MY_DURABLE_OBJECT: DurableObjectNamespace;
    //
    // Example binding to R2. Learn more at https://developers.cloudflare.com/workers/runtime-apis/r2/
    // MY_BUCKET: R2Bucket;
}

export interface Env {
    // Example binding to KV. Learn more at https://developers.cloudflare.com/workers/runtime-apis/kv/
    // MY_KV_NAMESPACE: KVNamespace;
    //
    // Example binding to Durable Object. Learn more at https://developers.cloudflare.com/workers/runtime-apis/durable-objects/
    // MY_DURABLE_OBJECT: DurableObjectNamespace;
    //
    // Example binding to R2. Learn more at https://developers.cloudflare.com/workers/runtime-apis/r2/
    // MY_BUCKET: R2Bucket;
}

What I am trying to understand is where the values

KVNamespace

KVNamespace

R2Bucket

R2Bucket

are coming from. In my wranlger.toml I have a

binding = "DB"

binding = "DB"

(in this case D1) but I don't know how to use

env.DB

env.DB

in the code since TypeScript says

DB does not exist on type Env

DB does not exist on type Env

. I understand it needs to be added into the interface but not sure how to reference it there.

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